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Generate Accounts
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Read Storage
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Craft Extrinsic
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<!-- Title -->
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<h1>
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<a href="../.." >Read Storage</a>
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</h1>
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<section class="normal markdown-section">
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<h1 id="read-storage">Read storage</h1>
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<p>Many important variables are available through the storage API. This example shows how to call a few of those APIs.</p>
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<pre><code class="lang-javascript"><span class="hljs-keyword">const</span> BN = <span class="hljs-built_in">require</span>(<span class="hljs-string">'bn.js'</span>);
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<span class="hljs-keyword">const</span> Api = <span class="hljs-built_in">require</span>(<span class="hljs-string">'@polkadot/api'</span>).default;
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<span class="hljs-keyword">const</span> WsProvider = <span class="hljs-built_in">require</span>(<span class="hljs-string">'@polkadot/api-provider/ws'</span>).default;
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<span class="hljs-keyword">const</span> storage = <span class="hljs-built_in">require</span>(<span class="hljs-string">'@polkadot/storage'</span>).default;
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<span class="hljs-keyword">const</span> provider = <span class="hljs-keyword">new</span> WsProvider(<span class="hljs-string">'ws://127.0.0.1:9944'</span>);
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<span class="hljs-keyword">const</span> api = <span class="hljs-keyword">new</span> Api(provider);
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<span class="hljs-keyword">async</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getAccountIndex</span> (<span class="hljs-params">address</span>) </span>{
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<span class="hljs-keyword">return</span> api.state.getStorage([storage.system.public.accountIndexOf, address]);
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}
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<span class="hljs-keyword">async</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getValidators</span> (<span class="hljs-params"></span>) </span>{
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<span class="hljs-keyword">return</span> api.state.getStorage([storage.session.public.validators]);
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}
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<span class="hljs-keyword">async</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getBlockPeriod</span> (<span class="hljs-params"></span>) </span>{
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<span class="hljs-keyword">return</span> api.state.getStorage([storage.timestamp.public.blockPeriod]);
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}
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<span class="hljs-keyword">async</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">main</span> (<span class="hljs-params"></span>) </span>{
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<span class="hljs-keyword">const</span> address = <span class="hljs-string">'5GoKvZWG5ZPYL1WUovuHW3zJBWBP5eT8CbqjdRY4Q6iMaDtZ'</span>;
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<span class="hljs-keyword">const</span> validators = <span class="hljs-keyword">await</span> getValidators();
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<span class="hljs-keyword">const</span> index = <span class="hljs-keyword">await</span> getAccountIndex(address);
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<span class="hljs-keyword">const</span> blockPeriod = <span class="hljs-keyword">await</span> getBlockPeriod();
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<span class="hljs-built_in">console</span>.log(<span class="hljs-string">`BlockPeriod: <span class="hljs-subst">${new BN(blockPeriod).toString(10)}</span> seconds`</span>);
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<span class="hljs-built_in">console</span>.log(<span class="hljs-string">`Account Index of <span class="hljs-subst">${address}</span>: <span class="hljs-subst">${index.toString(10)}</span>`</span>);
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<span class="hljs-built_in">console</span>.log(<span class="hljs-string">'Current validators'</span>, validators);
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}
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main().finally(_ => process.exit());
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</code></pre>
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